不锈钢Ⅱ型试样的应力腐蚀和氢致开裂

中国腐蚀与防护学报

1986, Vol. 6

Issue (4): 273-282

研究报告

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不锈钢Ⅱ型试样的应力腐蚀和氢致开裂

乔利杰;褚武扬;肖纪美;陆建栋

北京钢铁学院金物教研室;博士研究生;北京钢铁学院金物教研室;北京钢铁学院金物教研室;北京钢铁学院金物教研室

STRESS CORROSION CRACKING AND HYDROGEN INDUCED CRACKING IN AUSTENITIC STAINLESSSTEEL UNDER MODE Ⅱ LOADING

Qiao Lijie Chu Wuyang Hsiao Chimei and Lu Jiandong(Beijing Univ; of Iron and Steel Tech)

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摘要: 研究了奥氏体不锈钢(1Cr18Ni9Ti)Ⅱ型试样的应力腐蚀和氢致开裂。实验表明,该试样在沸腾MgCl_2溶液中能产生应力腐蚀,裂纹形核门槛值为K_(ⅡSCC)/K_(ⅢX)=0.16。但裂纹并不在缺口面的最大剪应力处(θ=80°)形核,而是在最大正应力处(θ=-110°)形核,并指向正应力的法线方向。该试样动态充氢时能发生氢致开裂,其门槛值K_(ⅡH)/K_(ⅡX)=0.59,远比应力腐蚀的值要高,当K_Ⅱ较高时,氢致裂纹在最大剪应力处形核。当K_Ⅱ较低时,则在最大三向应力处(θ=-110°)形核。应力腐蚀是解理断口,且与K_Ⅱ无关。而氢致开裂断口则与K_Ⅱ有关,K_Ⅱ较高时是分布有二次裂纹的剪切韧窝断口,K_Ⅱ较低时则是准解理断口。

Abstract：Stress corrosion cracking(SCC) and hydrogen induced cracking(HIC) of Type 321 stainless steel under mode Ⅱ loading were investigated with notched specimens. Experimental results showed that SCC in boiling 42% MgCl_2 solution initiated at the maximum normal stress site, i. e., at= -110° on the notch surface, rather than at the maximum shear stress site, i. e., at=80°, with orientation perpendicular to the direction of the maximum normal stress. However, HIC during dynamic charging initiated at the maximum shear stress site at higher E_Ⅱ or at the maximum normal atress site at lower K_Ⅱ. The threshold value of SCC of the Type 321 steel under mode Ⅱ loading was K_(Ⅱscc)/K_(Ⅱx)=0. 19, which was much lower than that of HIC during dynamic charging, i. e., K_(ⅡH),/K_(Ⅱx)=0. 59. The SCC fracture surface under mode Ⅱ loading different from those of HIC in morphology. These results lend support to the statement that SCC of austenitic stainless steel in boiling 42% MgCl_2 soluion is the anodic path dissolution mechanism and the maximum normal stress rather than the maximum shear stress plays a Controlling part in the SCC initiation.

收稿日期: 1986-08-25

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乔利杰;褚武扬;肖纪美;陆建栋. 不锈钢Ⅱ型试样的应力腐蚀和氢致开裂[J]. 中国腐蚀与防护学报, 1986, 6(4): 273-282.
. STRESS CORROSION CRACKING AND HYDROGEN INDUCED CRACKING IN AUSTENITIC STAINLESSSTEEL UNDER MODE Ⅱ LOADING. J Chin Soc Corr Pro, 1986, 6(4): 273-282.

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https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y1986/V6/I4/273

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